Carbureter



H. L. McCURDY.'

CARBURETER,

APPLICATION FILED IAN. 7. 1918.

1 324,5 10. Patented Dec. 9,1919.

2 SHEETSSHEET I.

amen 6oz \\m cm A3 (I mick/ M H. L. McCURDY.

CABBURETER.

APPLICATION FILED JAN. 1. 1918.

1 324,5 1 0. Patented Dec. 9, 1919.

2' SHEETS-SHEEI 2.

7 l2 2 V v 28% 1s 23 37 A To all whom it may concern:

UNITED STATES PATENT orrron.

HORACE L. M OCURDY, OF OAKWOO MICHIGAN, ASSIGNOR TO EDWARD MOZLOW, OF

' OAKWOOD, MICHIGAN.

I k GARBURETER.

Specification of Letters Iatent.

Application filed January 7, 1918. semi No. 210,013.

Be it known that I, HORACE L. MOOURDY, a citizen of the United States,and residin at Oakwood, in the county of Wayne and State of Michigan,have invented a new and Improved Carburetor, of which the following is aspecification.

This invention relates to devices for carbureting liquid fuel forinternal combustion engines, and its object is to provide a' valve tocontrol the flow of fuel into the carbureting chamber which valve shallbe opened in proportion to the movement of an actuating member, and toprovide a valve operatively connected to the fuel valve to control thefiow of air through the carbureting chamber whereby the reduction of airpressure in the carburetin chamber may be varied to cause they pronotion of mixtures of the proper richnesses for the difi'erentconditions of operations of the engines.

This invention consists in the details of construction illustrated-inthe accompany-.

ing drawings and more particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of thisimproved carbu-' reter. Fig. 2 is a plan thereof. 7 Fig. 3 is a centralvertical section at right angles to Fig. 1.= Figs. 4 and 5 are sectionson the line 44 of Fig. 3, showin the air valve in two diflerentpositions. ig. 6 is a view of the fuel valve and its operating stem.Fig. 7 is a view of the air valve. Figs. 8,

9 and 10 are views of the same valve from.

diflerent sides. Fig. 11 isa detail sectional view on a larger scale ofthe upper end of fuel passage.

Similar reference characters refer to like parts throughout the severalviews.

The ,carbureter shown in-the drawings has a float chamber 1 having a top2 that constitutes the bottom of the valve or carbureting chamber. Athreaded sleeve 3 connects to any source of fuel supply,and the smallfuel passage 4 may be closed by the float valve 5 that rests on a plate6 carried by the float 7 which is pivoted on the pin 9 carried by twoarms 10. This construction forms no part-of my invention.

A tube 12 screws up into the top 2 of By turning back tins plu the floatcham- Patented Dec. 9, 1919.

ber'mav be drained throug the passages 16,

17 and 19. A nut 20 on the lower end of the tube 12 holds the floatchamber and drain by the projection 30 on the arm 26. Any

other operating device for the valves may be employed.

Extending down through the valve stem 25 is a 'stem 32 which is heldfrom turning in the stem 25 in any desired manner. As shown in Fig. 2,the stem 25 is formed with radial slots 33 and the fingers formedthereby maybe caused to grip the stem 32 by means of a nut 34. The stem32 has a tongue 38 at its lower endthat extends into a slot in the upperend of the valve 35. Pins 36 extend through this stem 32 and position itrelative to the stem 25.

The valve 35 is shown in Figs. 3 and 6 to consist of the hollow lowerthreaded portion 37 having transverse passages 40 just below theshoulder 39. The upper end of the tube 12 is locked to the to 2 by meansof a nut 42, and the upper end of the passage 13 is counterbored to forma cup shaped depression 41, the upper end of which is slightly largerthan the shoulder 39. In a carbureter adapted to the Ford cars theeiiective distance between this shoulder and the wall of eter of theshoulder is .185 inch and the A diameter of the threaded portion 37 is.1285 inch. The wall of the cup at the upper end of the tube 12 arepreferably at an angle of 60 degrees to the horizontal. These dimensionsare not necessarily the best for all engines but good results have beenobtained with many hundred carbureters embodying them.

A butterfly-valve ll'on the stem is shown mounted on the intake passage46. The valve 24 has a circular outlet opening which registers with theoutlet passa e 4.8 when the valve is entirely open, as s own in Figs. 3and 4, but which is nearly closed when the engine is idling, as shown inFig. 8. As shown in Fig. 9, the'oval inlet opening49 in this valve isslightly smaller thanthe outlet opening, .which will cause a slightdecrease in pressure or increase in suction within the valve and aslight proportional increase in the flow of fuel when the air valve isentirely open.

When the engine is idling, the proportional flow of fuel is reduced byforming a hole 50 in the wall of the valve, as shown in Fig. 10, whichwill register with the intake passage 46, and thereby reduce the suctionwithin the valve and thereby reduce the proportional How of fuel. Whenthe air valve is opened for low working speeds, the two auxiliarypassages 51 are uncovered and register with the inlet passage 46, thusagain reducing the richnessof the mixture; Not until the engine isworking at more than half its full capacity does the air inlet increasemore slowly in size than the outlet 47.

It will be remembered that the effective distance that the fuel valve isopened depends entirely on the distance it is turned, but the flow offuel will also depend upon the suction, and this will be greatest whenthe valve is in the position shown in Fig. 4. T he suction will be leastwhen the engine is idling, so that the leanest mixture will then pass tothe engine. The mixture will slowly become richer after the passages 51have registered with the inlet passage 46.

The details and proportions of the various parts of this carbureter maybe changed by those skilled in the art without departing from the spiritof my invention set forth in the following claims.

I claim l. in a carbureter, the combination of a float chamber having acentral vertical screw threaded discharge passage, a hollow rotatablefuel valve screwed into the passage and having a circumferentialshoulder just above the upper end of the passage anc. radial holesthrough its wall just below the shoulder, a cylindrical oarburetingchamber above the iioat chamber and concentric with the fuel valve, anair valve rotatable therein and provided with radial inlet and outletthreaded discharge passage, a rotatable fuel valve screwed into saidpassage and provided with discharge openings, a cylindrical mixingchamber and a cylindrical air valve mounted above the float chamberconcentric with the fuel valve and extending below said dischargeopenings in the fuel valve, said air valve and carbureting chamberhaving radial inlet and outlet passages, and means connecting the airand fuel valves to cause them to turn together but permit longitudinalmovement between them.

3. In a carbureter, the combination of carbureting and float chambers, astem extending from the bottom of the float chamber to the-carburetingchamber, and having a transverse passage at its lower end, and alongitudinal passage extending therefrom to the carbureting chamber, ascreen over the transverse passage, a second transverse passage belowthe first and independent thereof, a longitudinal passage extendingdownwardly therefrom, and a valve to close the lower end of said secondlongitudinal passage said carbureting chamber having inlet and outletopenings.

4. ln a carbureter, the combination or a cylindrical carbureting chamberhaving an air inlet and an'outlet for the explosive mixture, an airvalve rotatable therein and formed with a circular outlet and with anoval main inlet and smaller auxiliary inlets, a fuel passage connectinginto the bottom of said chamber, a fuel valve co-axial with the airvalve rotatable in said passage, and means connecting said valves so asto cause them to turn together.

5. in a carbureter, the combination of a cylindrical carbureting chamberand an air valve rotatable therein, a tubular fuel passage connectinginto the bottom of said chamber co-axially with the air valve and havingits upper end cupped and internally threaded, a fuel valve having atubular lcwerend screwed into said passage and a shoulder just aboveradial holes connecting into the space in the lower end of the valve,said shoulder being adapted to move in and out of the cupped end of thepassage as the i valve is turned to regulate the flow of fuel into thecarbureting chamber, and means connecting said valves so asto cause themto turn together.

6. in a carbureter, the combination of a float chamber having a top anda central vertical screw threaded discharge passage in said top, ahollow rotatable screw-threaded iZE fuel valve mounted in said passageand havopenings, a valve chamber containing the ing a transverse notchin its upper end and air valve and having inlet and outlet openradialholes at the upper face of the top of ings, a central stem adjustablymounted in 10 the float chamber, a hollow air valve having the air valvehaving a flattened lower end 5 an open lower end rotatably mounted onextending into the notch in the fuel valve,

the top of the float chamber concentric with and means to turn said airvalve. the fuel valve, and having inlet and outlet HORACE L. MOCURDY.

